overlay: position_layer() takes an immutable window_size

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

src/overlay.cpp

@@ -275,7 +275,7 @@ float get_time_stat(void *_data, int _idx)
    return data->frames_stats[idx].stats[data->stat_selector] / data->time_dividor;
 }
 
-void position_layer(struct swapchain_stats& data, struct overlay_params& params, ImVec2 window_size)
+void position_layer(struct swapchain_stats& data, struct overlay_params& params, const ImVec2& window_size)
 {
    unsigned width = ImGui::GetIO().DisplaySize.x;
    unsigned height = ImGui::GetIO().DisplaySize.y;

src/overlay.h

@@ -151,7 +151,7 @@ extern double min_frametime, max_frametime;
 extern bool steam_focused;
 
 void init_spdlog();
-void position_layer(struct swapchain_stats& data, struct overlay_params& params, ImVec2 window_size);
+void position_layer(struct swapchain_stats& data, struct overlay_params& params, const ImVec2& window_size);
 void render_imgui(swapchain_stats& data, struct overlay_params& params, ImVec2& window_size, bool is_vulkan);
 void update_hud_info(struct swapchain_stats& sw_stats, struct overlay_params& params, uint32_t vendorID);
 void update_hud_info_with_frametime(struct swapchain_stats& sw_stats, struct overlay_params& params, uint32_t vendorID, uint64_t frametime_ns);